Hollow built-up material for wooden structures.



PATENTED MAR. 3, 1908.

J. HOELLIG & M. LIDSTER. HOLLOW BUILT-UP MATERIAL FOR WOODEN STRUCTURES.

APPLICATION FILED SEPT. 6, 1907.

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JOSEPH HOELLIG AND MILNER LIDSTER, OF LOS ANGELES, CALIFORNIA.

HoLLow BUILT-UP MATERIAL FOR WOODEN STRUCTURES.

Specification of Letters Patent.

Patented llfarch 3, 1908.

Application filed September 6, 1907. Serial No. 391,679.

To all whom it may concern:

Be it known that we, J OSEPH HOELLIG and l\/I1LNER LiDsrER, both.citizens of the United States, residing in the city pf Los Angeles,

. Wooden Structures, of which the built up material. g In forming wooden doors it has been cuscounty of Los Angeles, and State of California, have invented new and useful Improvements in Hollow Built-Up Material for following is a specification.

Our invention relates to hollow built up material for use in doors and other like structures and the object thereof is to provide a built up material formed of wood so secured together that a considerable portion of the center thereof shall consistof hollow channels whereby a strong, and light built up material is produced with a minimum amount of structural material. plish this object by the built up material described herein and illustrated in the accompanying drawings as forming a door, which drawing is a perspective view of the lower portion of a plain door constructed of tomary to use a central core formed of strips running longitudinally the door and to glue upon such longitudinal strips on both sides of the same cross strips. In gluing these strips more or less glue exudes from the' meeting edgesand before the outside veneer can be put upon the door it-is necessary that the glue shall become thoroughly set and dried and after'the glue is dried the material thus far prepared must be run a through a machine to .take oil the ridges of glue at the seams in order to have a smooth surface upon which to glue the outside veneer. In this process it requires two distinct and separate handlings of the central portions to which the veneer is secured, and the door is a solid heavy door.

In our improved door instead of forming a central core of solid material we provide central strengthening strips 1 which run longitudinally of the completed door and are provided with tongues 2 in the edges-thereof which are received in channels 3 in the coverboard 4. The grain of the outside filler pref erably runs at right angles to the grain of the strengthening strips. At the edges of.

. the door are the outside bands 5 which are tongued and grooved to fit int-o the outside channels of thecover-boards and to be flush with the surface thereof. Covering the cover-boards and edge bands are the sheets W'e accomof veneer 6. These outside bands are preferably of the same material as the veneer. If the edge of the door is veneered the bands can be omitted and a strengthening strip used which will be flush with the coverboard.

In the preparation of the arts the inside strengthening strips woul all be run through a stickerso as to be of uniform dimensions. The cover-boards would 2.1.20 be run through a machine which would reduce them to a uniform thickness and plow be placed upon the ress and the cover-board for that side woul be placed thereon with glue therebetween. The inside strengthening strips and the outside bands would then be placed in position with the required amount of glue at the respective meeting places. The cover-board'for the other side would then be placed in position with the required amount of glue at the joints. The veneer for the other side of the door would then be placed in position with the neces saryglue between it and the cover-board. The parts thus assembled would then be firmly pressed together in the usual well known manner and permitted to dry. By

this construction a door is produced that is much stronger than the ordinary built up door and at the same time is much lighter and takes less material and the same can be formed ready for use in much less time, as the parts can all be put together and glued at one operation.

Although we have shown our invention applied to a 5-ply hollow door, the same may be used in the formation of hollow window sashes, window frames, and in the construction of wooden furniture, suchv as desks, wardrobes and other like structures. In the construction of furniture it would not be necessary 7 that both sides should be provided with a veneer unless both parts of the built up boards are visible when in use. In some cases it would not be necessary to use a veneer as the cover-board could be used for the outside surface of the prepared article, but by use of the veneer a cheaper wood could be used for the cover-board to give the necessary strength and a thin veneer of more expensive wood used on the outside to pro,- duce a finished handsome appearance.

Having described our'invention what we claim 1s:

1. Built up material for use in wooden structures comprising strengthening strips spaced apart and provided with central longitudinal tongues and outside grooved cover-boards secured upon said strengthening strips, the grain of the strengthening strips running longitudinally the body, and the grain of the eoverboard running at right angles to that of the strengthening strips.

2. Built up material forwooden structures comprising spaced apart strengthening strips provided with central, longitudinal tongues on the side thereof, the grain of said strips running longitudinally the body thereof coverboards having the grain thereof running at right angles to the grain of the strengthening strips and having spaced apart grooves therein for the reception of the tongues of the strengthening strips; and outside veneer for said coverboards having the grain running at right angles to the grain of the cover board.

3. Abuilt up door composed of strengthening strips provided with longitudinal central tongues, said strips being s aced apart; cover-boards having channels t erein for the reception of the tongues of the strengthening strips; and veneer secured upon said cover-boards, the grain of the strengthen- -ing strips running longitudinally the body,

and the grain of the coverboard running at right angles to that of the strengthening strips.

4. Abuilt up door com osed of strengthening strips provided with longitudinal central tongues, said stri 5 being spaced apart; tongued and groove bands; cover-boards having channels therein for the reception of the tongues of the strengthening strip and E. E. HARPnAM, S. B. Aus'rm. 

